Boost.Jam (BJam) is a build tool based on FTJam, which in turn is based on
Perforce Jam. It
contains significant improvements made to facilitate its use in the Boost Build
System, but should be backward compatible with Perforce
Jam.

This is version 3.1.17 of BJam and is based on version 2.4 of Jam/MR:

+\
+\ Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
\+
This is Release 2.4 of Jam/MR, a make-like program.
License is hereby granted to use this software and distribute it
freely, as long as this copyright notice is retained and modifications
are clearly marked.
ALL WARRANTIES ARE HEREBY DISCLAIMED.